<!DOCTYPE html>
<html>
<head>
	<title>flash fontsize</title>
	<style type="text/css">
		body{
		    margin: 0;
		    padding: 0;
		    background: #000;
		}
		.container{
		    width: 100%;
		    height: 55vh;
		    display: flex;
		    justify-content: center;
		    align-items: center;
		    background: #000;
		}
		span{
			font-family: fira code;
			font-size: 10em;
			filter:blur(2px);
			color: #fff;
			animation: animate 2.5s linear infinite;
		}
		span:nth-child(1){
		    animation-delay: 0s;
		}
		span:nth-child(2){
		    animation-delay: 0.25s;
		}
		span:nth-child(3){
		    animation-delay: 0.5s;
		}
		span:nth-child(4){
		    animation-delay: 0.75s;
		}
		span:nth-child(5){
		    animation-delay: 1s;
		}
		span:nth-child(6){
		    animation-delay: 1.25s;
		}
		@keyframes animate{
		    0%,100%{
		        filter: blur(2px);
		        color: #fff;
		        text-shadow: 0 0 10px #1e90ff,
		        0 0 20px #1e90ff,  
		        0 0 30px #1e90ff,  
		        0 0 40px #1e90ff,        
		        0 0 100px #1e90ff,  
		        0 0 200px #1e90ff,  
		        0 0 300px #1e90ff,  
		        0 0 400px #1e90ff;
		    }
		    5%,95%{
		        filter: blur(0px);
		        color: #666;

		    }
		}

	</style>
</head>
<body>
	<div class="container">
		<span>R</span>
		<span>a</span>
		<span>g</span>
		<span>n</span>
		<span>a</span>
		<span>r</span>
	</div>
</body>
</html>